двумерный массив

#include<iostream>
using namespace std;
int main()
{
    const int a = 7;
    int array[a][a] = { {6, 0, 0, 1, 9, 4, 0},
                        {6, 0, 0, 1, 9, 4, 0},
                        {6, 0, 0, 1, 9, 4, 0},
                        {6, 0, 0, 1, 9, 4, 0},
                        {6, 0, 0, 1, 9, 4, 0},
                        {6, 0, 0, 1, 9, 4, 0},
                        {6, 0, 0, 1, 9, 4, 0} };
    for (int i = 0; i < a; i++)
    {
        for (int j = 1; j < a; j++)
        {
            int k = j;
            while (array[i][k - 1] == 0 && array[i][k] != 0)
            {
                int x = array[i][k];
                array[i][k] = array[i][k - 1];
                array[i][k - 1] = x;
                k--;
            }
        }
    }
    for (int i = 0; i < a; i++)
    {
        for (int j = 0; j < a; j++)
        {
            cout << array[i][j] << "";
        }
        cout << endl;
    }
}